ES2352584T3 - INJECTION MOLDING TOOL AND METHOD FOR INJECTION OF A SECTION OF A MOLDED PART. - Google Patents

Abstract

An injection moulding tool (20) with a nozzle section, comprises at least two adjustable mould sections, which form a hollow mould when placed together, closure elements which hold the mould closed in the injection position, and an extruder (22). The closure elements extend from the nozzle section and keep the mould sections in the closed position. Each mould section has a closure element in the form of a locking member, and each mould section and locking member are held in the closed position using a structured surface which is at an angle to the adjustment direction. The structured surface is saw toothed.

Description

The present invention refers to an injection molding tool for injection molding a section on a molded part and / or coating a section of a molded part, such as a vehicle part, in particular the lining of the wheel arch or the lower part of the body, which has a section of the nozzle comprising at least two molding jaws that can move relatively one relative to the other, which, in the injection position delimit a cavity in which a channel ends of injection, as well as at least one locking or locking element that acts in conjunction with at least one molding jaw 10 arranged in the nozzle section to hold at least one molding jaw that can be adjusted in the injection position, where the closing or locking element extends from the nozzle section, is designed in an adjustable manner with respect to it and locks the an adjustable molding jaw in its injection position and one of the molding jaws is a core of the mold that extends stationary from a mold holder of the nozzle section and at least one of the molding jaws is 15 arranged in an adjustable way with respect to the contour of the core.

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Furthermore, the present invention relates to a method for injection molding a section on a molded part and / or coating a section of a molded part, such as a vehicle part, in particular the lining of the wheel arch or the lower part of the body, where the molded part is inserted into some sections within a cavity surrounded by molding jaws relatively adjustable with each other and extends from a nozzle section of an injection molding tool, at least one of the jaws of molding is blocked by at least one closing element that extends from the nozzle section, by adjusting said element with respect to at least one molding jaw in its injection position and material capable of flowing is injected inside the cavity after the closure of the molding jaws (injection position).

From EP-A-1 396 329 a method and an installation are known for forming a section of a crankcase in a box shape. The injection molding tool used, in this case, is composed of a section of the nozzle and an injection part, where during the injection, the molding jaws that house the box-shaped section of the crankcase to be injected , are held in the injection position to avoid a mismatch during the injection.

From US-A-3,358,333 an injection molding tool is known, whereby a sole is injection molded from the top of a shoe. For this, the required molding jaws are adjusted and fixed by means of articulated levers that extend oscillatingly from the nozzle section of the tool and that can be actuated by cylinders that in turn are coupled by means of articulation in the frame of The injection molding tool.

US-A-5,422,059 is known for an injection molding tool consisting of a section of the nozzle and a closure piece. In this case, the closure piece can be adjusted with respect to the nozzle section by means of a hydraulic cylinder. The closure piece is driven along guides that extend from the nozzle section.

From DE-A-199 32 515 a tool is also known for a section of the nozzle and a closure piece. With this tool, boxes with stable handles can be injection molded. 40

According to the application DE-A-40 22 884, in the case of a plastic bottle case, an external element can be extended on the core element of a handle. Application EP-A-1 000 865 provides for a coating of a handle of a bottle case. The same can be observed in application DE-A-102 08 845.

In order to manufacture an injection molded part, according to the application DE-A-34 46 020, a mold cavity delimited by adjustable jaws is provided, which are adjusted so that different materials can be injected one after the other into the mold cavity.

According to the application JP-A-01072815, molded parts are manufactured through injection molding, where a cavity is delimited by molding jaws that can be held together when pressed into a support. In this way, the molding jaws are pressed inwards in a support by means of a section of the nozzle. The external surfaces of the molding jaws, and with it, the internal surfaces of the support, 50 have a conical development.

According to applications JP-A-2001058339 and JP-A-08066950, for the injection molding of plastic parts molding jaws are held together in their edge areas by annular closure pieces, as well as in the form of a claw, the which are adjustable with respect to molding jaws.

An injection molding tool is specified in application FR-B-1 076 318 for the injection of ring-shaped objects. For this, a plurality of external molding jaws, adjustable by articulated levers

upper, it is adjustable with respect to a molding jaw that forms an annular mold. Alternatively, the external molding jaws can be adjusted by means of upper cylinders.

In DE.Z .: Plastic transformers, volume 55, year 2004, No. 2, pages 20-23, there is a mold labeling (IN-MOULD-LABELLING) of bottle boxes, by injection molding. US 3,358,333 discloses an injection molding tool according to the preamble of claim 1 and a method according to the preamble of claim 6.

It is an object of the present invention to perfect such an injection molding tool of the kind mentioned in the introduction, as well as a similar method, so that in the case of a compact construction, a molded part such as boxes or piece of vehicles, such as wheel arch coverings, can be coated without difficulty at least in some sections, in these sections to obtain desired properties of the 10 materials, as well as to geometrically modify one or more desired sections, as well as to prolong them. Thus, it should also be possible to use independently of the place of manufacture of the molded part.

In accordance with the invention, this object will be achieved, mainly, because the locking or closing element, in the closed position of at least one adjustable molding jaw, is engaged in it by a positive joint. fifteen

A method is also provided for injection molding a section on a molded part and / or coating a section of a molded part, such as a vehicle part, in particular the lining of the wheel arch or the lower part of the body, where the The molded part is inserted in some sections into a cavity surrounded by molding jaws that are adjustable relative to each other and extends from a nozzle section of an injection molding tool, at least one of the molding jaws is blocked by at least 20 a closure element extending from the nozzle section, by adjusting said element with respect to at least one molding jaw in its injection position and material capable of flowing is injected into the cavity after of the closure of the molding jaws (injection position), which is characterized in that the molded part is arranged in one of the bites Molding aces that are designed as a core of the mold stationary disposed on a mold support of the nozzle section, at least one of the molding jaws is adjusted with respect to the core of the mold to form the cavity and , therefore, at least one of the molding jaws that are relatively adjustable with each other is locked therein by means of the hitch that has a positive joint of the locking or locking element.

In the respective dependent claims improvements can be observed.

Unlike the previously known injection molding tools, a similar tool is suggested in accordance with the present invention where, to secure or hold the molding jaws during injection, an adjustable closure piece, separated with regarding the nozzle section. Accordingly, the section of the nozzle is not covered by a closure piece during injection, so that, without difficulty, a section of the molded part can be coated or a section can be injected into the molded part. The molded part, by way of example, may consist of a box or a vehicle part such as the lining of the wheel arch or the lower part of the body, so that the molded part resides largely on the tool, which constitutes a possibility that is not present in the case of conventional injection molding tools, in which the molding jaws that extend from the nozzle section are blocked by an adjustable nozzle section, separated with regarding molding jaws. To separate the injection molded part, the closure part must be distanced in its circumference from the molded part, so that the molding part can be removed from the intermediate space between the nozzle section and the part of closing. For this, the nozzle section and the closure piece must be axially spaced so that the separation is greater than the extension of the injection molded part in the axial direction.

In accordance with the invention, the adjustable closure element, required to support the molding jaw (s), extends from the same section of the nozzle, so that an extremely compact injection molding tool is provided, due to which a large investment in machinery is not required for its use, where, for example, a section of a molded part, for example of a box, must be coated. In particular, according to the aforementioned, there is an advantage that the molded part to be coated or injected, can protrude greatly from the nozzle section. fifty

The cavity surrounded by the molding jaws, for the coating of a section of a molded part, in addition, is designed such that the cavity, at least in some sections, is distanced from the section to be coated. If necessary, the cavity can also circumferentially surround the section distantly.

If a section in a molded part must be injection molded, then within the cavity, where the section must be injection molded, the extent of the part area is often considerably smaller than the remaining space, where it is injected molten material capable of flowing.

In particular, it is envisioned that from the mold support of the nozzle section an outline of the core forming a stationary molding jaw is extended, so that, with respect to the core contour at least one molding jaw is arranged adjustable, preferably by means of a first pressure cylinder attached to the mold support, so that at least one adjustable locking element is extended from the mold support, preferably by a second pressure cylinder attached to the mold support; said locking element, in the closed position, is connected by a positive connection to the contour jaw and, preferably, is engaged in a recess of the molding jaw. In this way, the adjustment path of the molding jaw can be developed transversely, in particular vertically, with respect to the adjustment path of the locking element.

Through the theory according to the invention, by means of simple and constructive measures the possibility of injection molding also sections in large molded parts is presented, as well as also coating sections of the molded part. In this way, the molded part to be coated or to be injection molded can be positioned on a contour of the core that can be characterized as stationary molding jaw, with respect to which several molding jaws can be adjusted which, in turn, in the closed position, they enclose a mold cavity on the outer side. fifteen

In this way, the adjustable molding jaws could be arranged in a star shape around a contour of the core, where the molding jaws, in the closed position, extend to the same level one above the other in the area where it is limited. The cavity.

The adjustment of the contour jaws, therefore, can take place by means of pressure cylinders, as well as hydraulic ones, which extend from the nozzle section, that is, from its mold support. twenty

To block the molding jaws in the injection position, each molding jaw is assigned to a locking element which, preferably, is engaged in a recess of the molding jaw by a positive joint. Thus, the adjustment path of each molding jaw is preferably developed vertically with respect to each assigned locking element. The adjustment path of the molding jaw can be developed in parallel with respect to the plane that is held by the mold support, while the adjustment path of the locking element extends vertically with respect to the plane. In particular, the locking element is fitted with the adjustable pressure cylinder in the mold holder.

It should also be understood as a coupling in the molding jaws to an interaction with the piston, or with another element that moves along with the molding jaw.

Likewise, the present invention refers to a method for injection molding a section on a molded part 30 and / or coating a section of a molded part by injection molding, where the molded part is inserted into some sections within a surrounded cavity by molding jaws relatively adjustable with each other and extending from a section of the nozzle of an injection molding tool, where after the closing of the molding jaws in the injection position (closing position) material capable of flowing is injected into the cavity, so that at least one of the molding jaws is blocked by at least one closure element that extends from the nozzle section by adjusting said element with respect to at least one molding jaw in its injection position, where in particular the molding jaws are expected to be held in their in position injection through automatic locking by means of closing elements that extend from the nozzle section through their adjustment with respect to the molding jaws. 40

The figures show:

Figure 1: a side view of an arrangement for coating a section of a molded part, as well as for injecting a section into a molded part,

Figure 2: a top view of an installation for coating, as well as for injection molding sections, for example in molded parts,

Figure 3: A sector of an installation for coating, as well as for injection molding sections, for example in case-shaped molded parts,

Figure 4: the control device according to Figure 3 with a molded part oriented towards an injection molding tool,

Figure 5: the molded part according to Figure 4 in an insertion position with respect to the injection molding tool,

Figure 6: The molded part according to Figures 4 and 5 after coating, as well as injection molding and separation of the injection molding tool.

Figure 7: A sector of an injection molding tool for coating an inner wall of a molded part,

Figure 8: A sector of an injection molding tool for coating a central handle of a molded part,

Figure 9: A sector of an injection molding tool for coating an external handle of a molded part,

Figure 10: A sector of another embodiment of an injection molding tool,

Figure 11: a sector of the arrangement according to figure 10, 5

Figure 12: Another embodiment of an arrangement for injecting a molded part, as well as for coating a section of the molded part,

Figure 13: A sector of an installation to cover a central handle of a molded part,

Figure 14: A representation is perspective of a sector of the tool according to Figure 13,

Figure 15: a top view of a section of a section of the nozzle with a molded part to be injection molded or coated;

Figure 16: A perspective representation of the nozzle section according to Figure 15,

Figure 17: A section through the nozzle section according to Figures 15 and 16,

Figure 18: A section of the nozzle section according to Figure 17, and

Figure 19: A representation according to Figure 17 showing the inside of the tool. fifteen

The following description of Figures 1 to 14 explains preferred conformations, as well as arrangements and sectors of installations for injecting molded parts, as well as for coating sections of molded parts or injection molding sections of molded parts. Figures 1-14 describe devices and methods that do not correspond to the present invention. For the purpose of simplification, a bottle case is used here as a molded part. twenty

Molded parts include, in particular, plastic parts of the automotive vehicle industry, such as the lining of the wheel arch or the lining of the lower part of the body, just to name a few objects.

Next, the lining of a handle of a bottle box is also explained.

In Fig. 1, an installation 10 can be observed to cover a handle 12 of a box 14, which is transported along a conveyor belt 16 that can be formed by a transport band and, subsequently, by a device for control 18, is introduced into an injection molding tool 20, where the handle 12 is coated.

The handle 12 may consist of a handle similar to that present in the side wall of the box 14, but may also consist of a central handle, as explained by way of example in relation to figures 9, 13 and 30 14.

The injection molding tool 20 is attached to an extruder 22, whereby, in a known manner, the injection molding tool 20 is supplied with thermoplastic plastic capable of flowing into the existing nozzles. Thus, according to the invention, the injection molding tool 20 is composed of only one section of the nozzle, without the required separate closure piece being required according to the state of the art. 35 In this way, keeping the molding jaws that delimit a cavity closed, where a sector of the box is inserted and then coated, a handle in the example of execution, is achieved by elements that extend from the section of the nozzle. This is explained in detail by figures 4 to 14.

The unit composed of the injection molding tool 20 and the extruder 22 can thus be constructed in a compact manner, so that it can be used without difficulty in the desired locations and therefore 40 does not necessarily require that the tool Injection molding 20 is used where the same box is injected.

Due to this, the possibility of coating the bottles that are introduced in boxes in a bottling plant is presented, so that a subsequent coating of boxes that are already prepared for functional use is also possible. Four. Five

In particular, because of this, there is a possibility that mechanical obstruction does not occur because of a closure piece, since the molded part to be coated or injection molded can protrude greatly on the nozzle section . In addition, a separation of the molded part of the injection molding tool 20 can be carried out without any difficulty, since, according to the aforementioned, a piece of

The closure must not be previously distanced from the nozzle section in order to remove the part from the injection molding tool.

A top view of an installation 24 comprising several injection molding tools 26, 28, 30 with associated extruders 32, 34, 36, by which boxes 38, 40, 42 according to The required circumference. The boxes 38, 40, 42 are introduced in the tools 26, 28, 30 by 5 control devices 44, 46, 48; as well as withdrawals from them. For this, the boxes 38, 40, 42 are displaced by a conveyor belt 50 in the required position, between the respective control device 44, 46, 48 and the associated tool 26, 28, 30.

In Figure 3 a detail of the installation 10 can be observed, as well as of the 24. On a conveyor belt 52 boxes 54, 56 arranged there can be recognized, which must be coated. In this way, the outer handles 58, 60 can be coated; central handles that are not represented or also sections of the wall, especially sections of the internal wall.

In order for the respective box 54, 56 to be introduced into an injection molding tool, a control device 62 is provided comprising a base plate 66 extending from a rotating arm 64, with support guides 68, 70, 72, 74 which they extend from it and which can be placed in the angular guide of the box. 15 Also, the control device 62 has lateral arms 76, 78 that adjust with respect to each other, to support the case 56 laterally.

As soon as the support guides 68, 72, 74 are inserted into the angular guide of the box 56, the arm 64 rotates so that the boxes are aligned with their open side on a tool 80 and inserted therein. In turn, the tool 80 has a conventional construction with a mold holder 82, as well as with molding jaws, between which a section of the box 46 can be placed, to handle the section to be coated from a cavity where it is Injected thermoplastic plastic capable of flowing to the lining, by means of a section of the nozzle that is not represented here. By way of example only, two corresponding molding jaws are indicated in Figure 4 with reference numbers 84, 86.

To close and keep closed, as well as to open the molding jaws 84, 86; that is, to move them 25 apart from each other, the molding jaws 84, 86 act together with locking wedges 88, 90; whereby the molding jaws 84, 86 are held closed in the injection position.

Therefore, they represent the nozzle section of the tool 80, the mold holder 82, together with the molding jaws 84, 86; the nozzles present in the mold holder, which however are not represented, as well as indicated in detail. 30

If, according to the state of the art, a closure piece is assigned to the nozzle section through which the locking wedges 88, 90 are blocked; then, according to the invention, it is envisaged that a blockage will occur without a closure part, thanks to what results in an extremely compact construction unit for tool 80. The blocking, or rather, keeping the molding jaws closed 84, 86 is technically executed because the locking wedges 88, 90 are self-locking on the outside side in the injection position, for both with the molding jaws 84, 86 closed, as explained in detail in relation to figures 10 and 11.

After the lining of the box or sections of the box 56 and after the opening of the molding jaws 84, 86, that is to say, the separation of these through the mismatch of the locking wedges 88, 90 so vertical with respect to the plane held by the mold holder 82, the box 56 is removed from the control device 62, which fulfills the function of an ejection unit. Next, the box 56 is returned to the conveyor belt 40 52 to then introduce the following boxes into the tool 80, that is, according to the representation of Figure 3, the boxes 54.

In figure 7, in a representation of principle, a sector of an injection molding tool can be seen to cover areas of the inner wall of boxes. According to the main descriptions according to FIG. 4, from a mold support 92, molding jaws and associated locking wedges extend, which, by way of example, are indicated by reference signs 94, 96 for Molding jaws and 98, 100 for locking wedges. The molding jaws 94, 96 work together in an injection position, that is, in a closed, self-locking manner with respect to the associated locking wedges 98, 100, so that a blocking takes place exclusively through the section of the nozzle of the injection molding tool, without requiring a closure piece. fifty

Figure 8 shows a sector of a tool, by means of which a central handle of a box is covered. For this, two molding jaws 102 and locking wedges 104 associated thereto are required, which can be adjusted, in turn, along guide supports 106, 108; to be able to regulate the necessary movement vertically with respect to a plane held by the mold holder 110, where the molding jaws 102 and the locking wedges 104 are housed, that is, to open, as well as close and keep the molding jaws 102. 55

In figure 9, roughly, it represents a tool 112 which, likewise, only comprises only one section of the nozzle, where the existing handles must be coated on the side walls of a box. The tool 112, that is, the nozzle section, comprises a mold holder 114 with locking wedges that can be adjusted vertically with respect to the plane attached to it, by which the molding jaws that receive the handles can be adjusted , as well as the adjacent areas of the box. 5

As an example, two molding jaws that are associated with each other, are indicated by reference signs 116, 118 and the corresponding locking wedges that keep them closed and guide them, with reference signs 120, 122 The conduction of the locking wedges 120 occupies a section of the wall of the mold support, that is, in relation to the locking wedge 120, the right section of the wall 124 of the mold support 114. The internal locking wedges 122 are driven by guide beams that are not shown, which may also be sections of the base wall of the mold holder 114.

In order to keep the molding jaws closed in an injection position without a closing piece, according to the invention, it is required that the locking wedges be placed in a self-locking manner in the molding jaws, as explained in principle by means of figures 10 and 11. Naturally, other technical realization possibilities for achieving self-locking are also equally feasible. fifteen

A section of a nozzle section of an injection molding tool is shown in Figure 10. Two molding jaws 126, 128 adjustable with respect to each other and the locking wedges 130, 132 associated therewith can be observed. The travel directions of the molding jaws 126, 128, as well as the locking wedges 130, 132 are symbolized by double arrows. In the closed position shown in Figure 10, the molding jaws 126, 128 are placed one above the other on an inner surface and surround a cavity 20 134, where a section of the box 54, 56 to be coated is introduced , namely, in the example of figure 10, a side handle. In this way, the cavity 134 surrounds the side handle in a distanced manner, in order to cover the rest of the cavity with thermoplastic plastic which is supplied through a nozzle 136 to carry out the coating. In this case it is a less rigid material compared to the case material, to provide convenient support properties. 25

To ensure that during injection the molding jaws 126, 128 are not pressed separately, so that the molding jaws 126, 128 are locked or kept closed, the locking wedges 130, 132 are self-locking in the external surfaces of the molding jaws 126, 128. This can be seen in detail in the sector shown in Figure 11.

Figure 11 shows a section of the molding jaw 128, illustrated on the right in Figure 10, and of the locking wedge 132 associated therewith. The molding jaw 128 and the locking wedge 132 are in the closed position, self-locking one on the other, on surfaces 134 and 136, so that when the plastic material is injected it prevents the molding jaws 126, 128 are pressed separately, without requiring a separate closure piece, as is the case in conventional injection molding tools. 35

To execute the self-locking, the limiting surfaces 134, 136 have a structure similar to that of the teeth of a saw. This can be done through consecutive areas of first, second and third sections. Thus, a first section 138 extends the length of an adjustment direction (double arrow 144) of the molding jaw 128. A second section 142 extends along an adjustment direction (double arrow 140) of the locking wedge 132. Between the first section 138 and the second section 142 extends a third section 146 that develops along a plane that extends in the center from the respective surface 134 or 136 of the locking wedge 132 or of the molding jaw 128, so that it corresponds to the complete development of the surfaces 134, as well as 136. Areas with corresponding sections 138, 142, 146 are then added to form the sawtooth-like structure. of the surface 136.

The surface 134 of the molding jaw 128 has a corresponding structure, where, however, the surfaces 134, 136 are located one above the other, the first sections 138, 139 and the third sections 146, 147 extend spaced apart from each other. to others. On the contrary, the second surfaces 142, 143 are placed one above the other in some sections. Due to this, in the closing position, a self-locking is achieved through the second sections 142, 143, so that the second section 142, 143 must not necessarily extend parallel to the adjustment direction 144 of the wedge of block 132, but must comprise an angle α 50 which, however, must be less than 6 °, especially must be located in a range between 5 ° and 6 °.

The locking wedge 132 and with it also the locking wedge 130- not only keeps the molding jaws 126, 128 closed; it also causes their movement, that is, their separation (double arrow 140). To enable this despite the self-locking to be performed, the locking wedge 132, with a T-shaped drag element 148, is engaged in a T-shaped recess 150 of the molding jaw 126, 128, as it can be observed in figure 11a. Thus, the T-shaped drag element 148 extending along the surfaces 134, 136; It is arranged with play in the housing 150, so that for the opening of the tool an adjustment of the locking wedge 130, 132 in the direction of the double arrow 144 is performed first, without the molding jaws 126, 128 be dragged directly. Only when the drag element 148 is positioned

with its transverse wing 152 on the internal surface 154 of the cavity 150, on the side of the associated locking wedge, the molding jaws 126, 128 move along the double arrow 140, due to which the mold opens and, with it, the box, as well as the coated handle, can be removed. In this case, the drag element 148 is designed in the form of a slat and extends parallel to the central surfaces 134, 136 of sections 138, 139, 142, 143, 146, 147. 5

Figure 12 explains another conformation. In this case, not only is a tool extended from the support plate 156, as explained above, to cover a section of a box, but also a second injection molding tool 158 composed of a section of the nozzle 160 and a closure piece 162, whereby the same box is injected. After the box is injected and the tool is opened, the box is introduced into the tool 157 by means of a control device that is not represented, for example, to cover a central handle. The second tool 158 may have a conventional construction for coating boxes, so that no other explanation related to it is required.

It should be noted, with respect to Figures 13 and 14, that these variants can be considered to cover a central handle 164 of a box. In contrast to the exemplary embodiments of Figures 1-12, the molding jaws 166, 168 surrounding the central handle 164 are not guided by locking wedges and are kept closed by them. Rather, this takes place through blocking units that are not represented in detail, which can be hydraulically operated. However, the blocking unit is also found in the nozzle section of the tool, so that a closing piece is not necessary.

To insert the box 170 which has the central handle 164 in the tool, that is, between the molding jaws 164, 168; according to FIG. 13, a lifting device 172 is provided, by which the box 170 is raised, as well as 20 lowered. The lifting device 172 comprises in this case a plate-shaped section 174, on which the box 170 is positioned. The lifting device 172 extends between conveyor belts that end up separated from each other, where section 174 encloses the intermediate space when the box 170 has been lowered. Due to this, the possibility exists that the box 170, from the plate 174 and through the transport of boxes, is deposited in an adjacent transport belt. 25

An embodiment example of an injection molding tool according to the invention is explained by means of figures 15 to 19, by means of which an edge 198 must be injected into a molded part 196. In the exemplary embodiment the molded part 196 consists of a lining of the wheel arch, that is, in a vehicle part.

According to the invention, the injection molding tool has a section of the nozzle 200, from which molding jaws and locking wedges are extended, which will be described in detail below, without requiring an adjustable closure piece and separable, separated from the nozzle section 200.

The section of the nozzle 200 has a mold holder 202 on which a core of the mold 204 (also called a contour core) is arranged, designed as a stationary molding jaw, whose external contour corresponds to the internal contour of the passage lining of wheel 196 in a circumference, so that the area where the edge 198 must be injected is housed between the contour core 204 and the molding jaws 206, 208, 210, 212, 214 adjustable with respect to the contour core . In this way, the area of the lining of the wheel passage 196, indicated in Figure 18 by the reference sign 197, is housed in such a way between the contour core 204 and the molding jaws 206, 208, 210 , 212, 214; that during the injection the plastic cannot leave the mold cavity 215 surrounded by the molding jaws 206, 208, 210, 212, 214, while the edge 198 is injected into the molded part 196. Also, the edge 198 does not it is injected only butt in section 197 of the lining of the wheel passage 196, but extends superimposedly on some contiguous sections at the edges of the longitudinal side of section 197, as in principle can be seen in Figure 18 .

For adjusting the molding jaws 206, 208, 210, 212, 214, piston cylinder units 216, 218, 220, 222, 224, 228 extend from the mold holder 202, which, preferably, are hydraulically operated 45.

The molding jaws 206, 208, 210, 212, 214 are arranged in approximately the shape of a star around the contour core 204 and are adjustable with respect thereto, so that in the closed position (Figures 15, 16 , 17,18) the molding jaws 206, 208, 210, 212, 214 extend to the same level over each other in their sections that extend from the side of the cavity, so that the plastic cannot leave the cavity 215.

To block the molding jaws 206, 208, 210, 212, 214 in the injection position, each molding jaw 206, 208, 210, 212, 214 is associated with a locking element 206 in the form of a sliding guide, which, in turn, can be adjusted by an arrangement of the piston-type cylinder 228, where, preferably, a hydraulic cylinder is used. 55

The sliding guide or the locking piston 226 has at its free end a blocking section that decreases towards the free front surface; said blocking section engages in a corresponding recess 230, when the

Molding jaw 206, 208, 210, 212, 214 in injection position. This can be seen in the representation of Figure 17. Likewise, it can be recognized that the adjustment path of each molding jaw 206, 208, 210, 212, 214 extends vertically with respect to the adjustment path of the locking piston 226, the which, for its part, is housed in the mold holder 202 and whose surfaces block the molding jaws 206, 208, 210, 212, 214. 5

Through the arrangement of contour cores 204, of the molding jaws 206, 208, 210, 212, 214 adjustable thereto and of the locking pistons 226, it is ensured that also in case the pressure within the pressure within the piston cylinder units 216, 218, 220, 222, 224, 228, when a fault occurs, the molding jaws 206, 208, 210, 212, 214 remain locked in the injection position, since, conditioned by the force of gravity, the locking pistons 226 are held in recesses 230 of the molding jaws 206, 208, 10 210, 212, 214.

Figure 19 shows the section of the nozzle 200 showing the inside of the tool, therefore, the molding jaws 206, 208, 210, 212, 214 spaced apart from the contour cores 204. In this position the piston of locking 226 is retracted, so that free mobility of the molding jaws 206, 208, 210, 212, 214. is possible.

Since the lock for the molding jaws 206, 208, 210, 212, 214 extends from the same section of the nozzle 200, the molded part 196 - the lining of the wheel arch, in the exemplary embodiment - can be inserted in the tool, as well as removal of it, without impediments, so that long durations of the cycle are also possible.

twenty

Claims (7)

1. Injection molding tool for injection molding a section on a molded part (196) and / or coating a section of a molded part, such as a vehicle part, in particular the lining of the wheel arch or the bottom of the body, which has a section of the nozzle (200) comprising at least two molding jaws (204, 206, 208, 210, 212, 214) that can move relatively relative to each other, which, in the injection position they delimit a cavity (215) in which an injection channel ends, as well as at least one locking or locking element (226) that acts together with at least one molding jaw disposed in the section of the nozzle to hold at least one molding jaw that can be adjusted in the injection position, where the locking or locking element extends from the nozzle section, is designed in an adjustable manner with respect to it and it blocks at least one adjustable molding jaw in its injection position and one of the molding jaws is a mold core (204) that extends stationary from a mold support (202) of the nozzle section (200) and at least one of the molding jaws (206, 208, 210, 212, 214) is arranged in an adjustable manner with respect to the mold core, characterized in that the closing or locking element (226) in the closing position of At least one jaw of 15 molding (206, 208, 210, 212, 214) is engaged in the latter by means of a positive joint. 2. Injection molding tool according to claim 1, characterized in that the locking or locking element (226) is engaged in a recess (230) of at least one adjustable molding jaw (206, 208, 210, 212, 214). 3. Injection molding tool according to claim 1 or 2, characterized in that the adjustment path 20 of at least one adjustable molding jaw (206, 208, 210, 212, 214) extends transversely, in particular of vertical shape, with respect to the adjustment path of the closing or locking element (226). 4. Injection molding tool according to at least one of the preceding claims, characterized in that several molding jaws (206, 208, 210, 212, 214) are arranged star-shaped or approximately star-shaped around the contour core (204) and in the closed position they extend to the same level one above the other in their sections that extend from the side of the cavity. 5. Injection molding tool according to at least one of the preceding claims, characterized in that at least one of the molding jaws (206, 208, 210, 212, 216) that adjusts with respect to the contour core (204 ) is connected by a first pressure cylinder (216, 218, 220, 222, 224) attached to the mold support (202), and / or the closing or locking element (226), is connected by a second pressure cylinder 30 (228) attached to the mold support. 6. Method for injection molding a section on a molded part (196) and / or coating a section of a molded part, such as a vehicle part, in particular the lining of the wheel arch or the lower part of the body, where the molded part is inserted in some sections into a cavity (215) surrounded by molding jaws (204, 206, 208, 210, 212, 214) relatively adjustable with each other and extends from a section of the nozzle (200 ) of an injection molding tool, at least one of the molding jaws is blocked by at least one closure element (226) extending from the nozzle section, by adjusting said element with respect to at least one molding jaw in its injection position and material capable of flowing is injected into the cavity after the closure of the molding jaws in the injection position, characterized in that the molded part (196) is tra arranged in one of the molding jaws 40 that is designed as a mold core (204) stationary disposed on a mold support (202) of the nozzle section (200), at least one of the molding jaws (204, 206, 208, 210, 212, 214) is adjusted with respect to the mold core to form the cavity (215) and, therefore, at least one of the molding jaws relatively adjustable with each other is found locked therein by means of the coupling which has a positive connection of the closing or locking element (226) 45 7. Method according to claim 6, characterized in that an edge (198) of a wheel passage liner is inserted as the molded part (196) into the cavity (215) delimited by the mold core (204) and by at least one molding jaw (206, 208, 210, 212, 214,) that fits relatively with respect to it.